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X in (-oo:+oo)
X/5 = 24/40 // - 24/40
X/5-(24/40) = 0
X/5-3/5 = 0
1/5*X-3/5 = 0 // + 3/5
1/5*X = 3/5 // : 1/5
X = 3/5/1/5
X = 3
X = 3
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